Module: SAGA Wetness Index
(c) 2001 by J.Boehner, O.Conrad
Menu: Terrain Analysis > Hydrology > Catchment Area
Description
The 'SAGA Wetness Index' is, as the name says, similar to the 'Topographic Wetness Index' (TWI), but it is based on a modified catchment area calculation ('Modified Catchment Area'), which does not think of the flow as very thin film. As result it predicts for cells situated in valley floors with a small vertical distance to a channel a more realistic, higher potential soil moisture compared to the standard TWI calculation.
References
- Boehner, J., Koethe, R. Conrad, O., Gross, J., Ringeler, A., Selige, T. (2002): Soil Regionalisation by Means of Terrain Analysis and Process Parameterisation. In: Micheli, E., Nachtergaele, F., Montanarella, L. [Ed.]: Soil Classification 2001. European Soil Bureau, Research Report No. 7, EUR 20398 EN, Luxembourg. pp.213-222.
Parameters
Name | Type | Identifier | Description | Constraints |
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Input |
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Elevation | Grid (input) | DEM | | |
Output |
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Catchment area | Grid (output) | C | | |
Catchment slope | Grid (output) | GN | | |
Modified catchment area | Grid (output) | CS | | |
Wetness index | Grid (output) | SB | | |
Options |
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t | Floating point | T | | Minimum: 0.000000 |